Replacement Flywheel Washer compatible with GPH 346 Engine - Hirobo HI0403226  [HI0403226]

GPH 346 washer specification

This Hirobo HI0403226 flywheel washer is a direct replacement component for GPH 346 engine assemblies used in RC helicopter models. It sits between the flywheel and crank to keep correct spacing and positional stability during engine operation.

The washer is supplied as a single element designed to manage clearance and alignment within the flywheel stack. During normal use it helps preserve steady engagement between the flywheel and adjacent parts, contributing to improved idle characteristics and dependable starting on model piston engines.

Installation notes: verify correct orientation of the washer on the flywheel shaft and confirm axial clearance after assembly. Recheck runout and ensure a secure fit before attempting flight. If rubbing or unusual vibration is found, inspect mating components for wear and replace damaged parts rather than forcing assembly.

Tuning role: the washer forms part of minor setup adjustments when tuning engine balance and clearances. Fitting the correct washer maintains the intended flywheel location, which aids repeatable timing and consistent throttle response while trimming.